EP2549309A2 - Backlight unit and display devices including the same - Google Patents

Backlight unit and display devices including the same Download PDF

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Publication number
EP2549309A2
EP2549309A2 EP12161316A EP12161316A EP2549309A2 EP 2549309 A2 EP2549309 A2 EP 2549309A2 EP 12161316 A EP12161316 A EP 12161316A EP 12161316 A EP12161316 A EP 12161316A EP 2549309 A2 EP2549309 A2 EP 2549309A2
Authority
EP
European Patent Office
Prior art keywords
light
light guide
guide plates
backlight unit
display device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12161316A
Other languages
German (de)
English (en)
French (fr)
Inventor
Seung Hwan Baek
Eui Jeong Kang
Chan-Jae Park
Young-Keun Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Display Co Ltd
Original Assignee
Samsung Display Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Display Co Ltd filed Critical Samsung Display Co Ltd
Publication of EP2549309A2 publication Critical patent/EP2549309A2/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources

Definitions

  • the invention herein relates to a backlight unit and a display device including the backlight unit, and more particularly, to a backlight unit including light guide plates, and a display device including the backlight unit.
  • LCD liquid crystal display
  • EDP electrophoretic display panel
  • Such backlight units include a light source for emitting light, and a light guide plate for guiding the light from the light source to a display panel. If necessary, the light guide plate may be provided in plurality.
  • the light source since the light source is disposed between the light guide plates, light emitted from the light source may leak upward through a space between the light guide plates. Furthermore, the leaking light may degrade displaying quality of the display panel.
  • the invention provides a backlight unit and a display device including the backlight unit, to thereby improve displaying quality of the display device.
  • Embodiments of the invention provide backlight units including a plurality of light guide plates, a light source part, an optical member, and an optical diffusion member.
  • Each of the light guide plates includes a light incident surface through which light is incident, and a light emitting surface through which the light is guided and emitted, and the light guide plates are spaced apart from each other with the light incident surfaces facing each other.
  • the light source part disposed in a space between the light guide plates, and includes a plurality of light source units each including light sources spaced apart from each other, and at least one printed circuit board on which at least one of the light source units is mounted Neighboring light sources emit light in opposite directions.
  • the optical diffusion member includes a diffusing part disposed over the space between the light guide plates to diffuse light that is emitted from the light sources, leaks through the space between the light guide plates, and propagates toward the light emitting side of the light guide plates, and at least one supporting part protruding from the diffusing part in a direction opposite to the light emitting side of the light guide plates, and inserted in a space between the light sources.
  • the diffusing part may include a reflective film attached thereto on a surface facing the optical member.
  • the reflective film may include micro lenses on a surface facing the optical member, or may include diffusion beads therein.
  • the diffusing part may include at least one protrusion protruding toward the optical member to space the light guide plate apart from the optical member.
  • the diffusing part may have a dome or convex shape.
  • the backlight units may further include a light guide plate supporting member that is disposed under the space between the light guide plates, and is coupled to the optical diffusion member to support the light guide plates.
  • the optical diffusion member may include a through hole passing through the diffusing part
  • the light guide plate supporting member may include a coupling hole corresponding to the through hole
  • the backlight unit may further include a coupling member inserted in the through hole and the coupling hole to couple the optical diffusion member to the light guide plate supporting member.
  • the optical diffusion member may include a catching protrusion at a lower end of the supporting part, the catching protrusion may have a greater area than that of the supporting part with respect to a cross-section perpendicular to a direction of light emitted from the light guide plates, and the light guide plate supporting member may be disposed under the light guide plate, and include an accommodating recess in which the catching protrusion is inserted and fixed.
  • display devices include: a display panel displaying an image; the backlight unit supplying the display panel with light; an upper cover; and a lower cover.
  • the upper and lower covers accommodate the display panel and the backlight unit.
  • the optical diffusion member may include a through hole passing through the diffusing part
  • the lower cover may include a coupling hole corresponding to the through hole
  • the display device may further include a coupling member inserted in the through hole and the coupling hole to couple the optical diffusion member to the light guide plate supporting member.
  • FIG. 1 is an exploded perspective view illustrating an exemplary embodiment of a display device according to the invention
  • FIG. 2 is an exploded perspective view illustrating a coupling structure of a light source part, light guide plates, an optical diffusion member, and an optical member of FIG. 1 ;
  • FIGS. 3A and 3B are perspective views illustrating the light source part of FIG. 2 ;
  • FIGS. 4A to 4C are perspective views illustrating exemplary embodiments of optical diffusion members applicable to a display device according to the invention.
  • FIGS. 5A and 5B are enlarged views illustrating exemplary embodiments of portion B of FIG. 4A ;
  • FIG. 6 is a cross-sectional view illustrating an exemplary embodiment of a coupling structure of an optical diffusion member, light guide plates, a light source part, and an optical member according to the invention.
  • FIGS. 7 to 9 are cross-sectional views illustrating exemplary embodiments of backlight units of display devices according to the invention.
  • first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the invention.
  • spatially relative terms such as “lower,” “under,” “above,” “upper” and the like, may be used herein for ease of description to describe the relationship of one element or feature to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “lower” or “under” relative to other elements or features would then be oriented “above” relative to the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
  • FIG. 1 is an exploded perspective view illustrating an exemplary embodiment of a display device according to the invention.
  • FIG. 2 is an exploded perspective view illustrating a coupling structure of a light source part, light guide plates, an optical diffusion member, and an optical member of FIG. 1 .
  • FIGS. 3A and 3B are perspective views illustrating the light source part of FIG. 2 .
  • a display device 500 includes a display panel 100, a backlight unit 200, an upper cover 310, and a lower cover 320.
  • the display panel 100 may be any one of various display panels such as a liquid crystal display (“LCD”) panel and an electrophoretic display panel (“EDP").
  • LCD liquid crystal display
  • EDP electrophoretic display panel
  • a LCD panel is exemplified as the display panel 100.
  • the display panel 100 has a rectangular plate shape with short and long sides.
  • the display panel 100 includes an array substrate 110, an opposite substrate 120 facing the array substrate 110, and a liquid crystal layer (not shown) disposed between the array substrate 110 and the opposite substrate 120.
  • the array substrate 110 may include a plurality of pixels (not shown) in a matrix shape.
  • each pixel may include a gate line (not shown) extending in a first direction, e.g., in a direction parallel to a side of the array substrate 110, a data line (not shown) extending in a second direction crossed with the first direction and electrically insulated from the gate line, and a pixel electrode (not shown).
  • Each pixel may include a thin film transistor (not shown) that is electrically connected to the gate line, the data line, and the pixel electrode. Each thin film transistor switches a driving signal that is provided to the corresponding pixel electrode.
  • Driver integrated circuits (“ICs”) 130 may be disposed at a side of the array substrate 110. The driver ICs 130 receive various signals, and output signals for driving the display panel 100, in response to various input control signals.
  • the opposite substrate 120 may include a red, green and blue (“RGB”) color filter (not shown) and a common electrode (not shown) on a surface thereof.
  • the RGB color filter uses light to create a predetermined color.
  • the common electrode is disposed on the RGB color filter, and is opposed to the pixel electrode.
  • the RGB color filter may be formed through a thin film process.
  • the opposite substrate 120 includes the RGB color filter in the exemplary embodiment, but is not limited thereto. In an alternative embodiment, for example, the RGB color filter may be disposed on the array substrate 110.
  • the liquid crystal layer has a specific arrangement direction according to an electric field formed between the pixel electrode and the common electrode, to thereby adjust the transmissivity of light emitted from the backlight unit 200, so that the display panel 100 can display an image.
  • the backlight unit 200 is disposed under and overlapping the display panel 100.
  • the backlight unit 200 includes a plurality of light guide plates 210, at least one light source part 220, an optical member 230, a reflective sheet 240, and an optical diffusion member 250 for diffusing light from the light source part 220 leaking between adjacent light guide plates 210.
  • the light guide plates 210 are adjacent to each other and both disposed under the display panel 100, and guide light emitted from the light source part 220 to the display panel 100.
  • the light guide plates 210 are spaced apart from each other in a plan view of the displace device 500 such that side surfaces thereof face each other.
  • Each of the light guide plates 210 includes a light incident surface 211 through which light is incident, and a light emitting surface 212 emitting the light incident through the light incident surface 211.
  • the light emitting surface 212 may face an incident surface of the display panel 100.
  • the light source part 220 is disposed between the light guide plates 210, and includes a plurality of light source units L.U including light sources 221 and 222 spaced apart from one another, and at least one printed circuit board 223 on which the light source units L.U are mounted.
  • the light sources 221 and 222 of the light source unit L.U emit light in opposite directions to the light guide plates 210, respectively, as indicated by the dotted line arrows in FIGS. 3A and 3B .
  • the light source units L.U may be mounted on a single board as the printed circuit board 223, to thereby constitute the light source part 220.
  • the light source units L.U may be mounted on a plurality of separate boards as a plurality of printed circuit boards 223, respectively, to thereby constitute the light source part 220.
  • One of the light sources 221 and 222 which emits light to any one of the light guide plates 210, may be referred to as a first light source (also denoted by 221), and the other of the light sources 221 and 222, which emits light to the other of the light guide plates 210, may be referred to as a second light source (also denoted by 222).
  • power may be separately applied to the first and second light sources 221 and 222 to perform a local dimming operation on the backlight unit 200.
  • the optical diffusion member 250 includes a diffusing part 251 and supporting parts 252, and diffuses light from the light sources 221 and 222 leaking between the light guide plates 210.
  • the optical member 230 is disposed between the display panel 100 and the plurality of light guide plates 210. That is, the optical member 230 is disposed at the side of the display panel 100 to which light is emitted from the light guide plates 210, e.g., is disposed over the light emitting surfaces 212 of the light guide plates 210.
  • the optical member 230 controls light emitted from the light guide plates 210.
  • the optical member 230 may include a diffusion sheet, a prism sheet, and/or a protective sheet, which are sequentially stacked on the light guide plates 210.
  • the diffusion sheet diffuses light emitted from the light source part 220.
  • the prism sheet collects the light, diffused by the diffusion sheet, in a direction perpendicular to a plane of the display panel 100 disposed over the prism sheet. Most of the light passing through the prism sheet is perpendicularly incident to the display panel 100.
  • the protective sheet is disposed on the prism sheet. The protective sheet protects the prism sheet from external shock.
  • the optical member 230 includes a single sheet as each of the diffusion sheet, the prism sheet, and the protective sheet, but is not limited thereto.
  • at least one of the diffusion sheet, the prism sheet, and the protective sheet may be provided in plurality to form the optical member 230, or one of the diffusion sheet, the prism sheet, and the protective sheet may be removed.
  • the reflective sheet 240 reflects otherwise wasted light back to the display panel 100, and is disposed under the light guide plates 210.
  • the reflective sheet 240 includes a light reflecting material.
  • the reflective sheet 240 is disposed on the lower cover 320 to reflect light emitted from the light source part 220. Thus, the reflective sheet 240 increases the amount of light provided to the display panel 100.
  • the upper cover 310 is disposed over the display panel 100, and has a shape corresponding to the shape of the display panel 100.
  • the upper cover 310 includes an upper surface 312 having a display window 311 exposing the display panel 100 and supporting an edge of the top surface of the display panel 100, and a side surface 314 extending from the upper surface 312 toward the lower cover 320. Since the display panel 100 has a rectangular plate shape, the side surface 312 of the upper cover 310 may include four side surfaces 314.
  • the upper cover 310 is coupled to the lower cover 320 to support the edge of the top surface of the display panel 100.
  • the lower cover 320 is disposed under the backlight unit 200.
  • the lower cover 320 includes a bottom surface 322 having a shape corresponding to the shapes of the display panel 100 and the backlight unit 200, and a side surface 324 extending upward toward the upper cover 310 from the bottom surface 322. Since the display panel 100 and the backlight unit 200 have a tetragonal shape, the side surface 324 of the lower cover 320 may have four side surfaces 324.
  • the lower cover 320 has a space defined by the bottom surface 322 and the side surface 324, to thereby accommodate the display panel 100 and the backlight unit 200.
  • the lower cover 320 is coupled to the upper cover 310 to accommodate and support the display panel 100 and the backlight unit 200.
  • FIGS. 4A to 4C are perspective views illustrating exemplary embodiments of optical diffusion members applicable to a display device according to the invention.
  • FIGS. 5A and 5B are enlarged views illustrating exemplary embodiments of portion B of FIG. 4A .
  • FIG. 6 is a cross-sectional view illustrating an exemplary embodiment of a coupling structure of an optical diffusion member, light guide plates, a light source part, and an optical member according to the invention.
  • the optical diffusion member 250 includes the diffusing part 251 and the supporting parts 252, and diffuses light leaking between the light guide plates 210 from the light sources 221 and 222.
  • the diffusing part 251 is disposed over and overlaps a space between the adjacent light guide plates 210. That is, the diffusing part 251 covers the upper portion of the space between the light guide plates 210.
  • the diffusing part 251 diffuses light that leaks between the light guide plates 210 from the light sources 221 and 222, and that propagates in the direction of light emitted from the light guide plates 210. That is, the diffusing part 251 diffuses light that leaks between the light guide plates 210 from the light sources 221 and 222, and that propagates toward the display panel 100.
  • the diffusing part 251 has a tetragonal plate shape with short and long sides.
  • the length of the long sides of the diffusing part 251 may be equal to or greater than the length of the space between the light guide plates 210.
  • the length of the short sides of the diffusing part 251 may be greater than the width of the space between the light guide plates 210. In one embodiment, for example, the length of the short sides may be from about 10 millimeters (mm) to about 15 mm.
  • the diffusing part 251 may include one or more protrusions 256 that protrude from a surface facing the optical member 230, to space the optical member 230 a certain distance from the light guide plates 210.
  • the diffusing part 251 may be provided with a reflective film 255 attached to the surface facing the optical member 230.
  • the reflective film 255 may include a translucent material, e.g., translucent polyethylene terephthalate ("PET").
  • PET translucent polyethylene terephthalate
  • the reflective film 255 may include micro lenses 255A protruding from the surface facing the optical member 230.
  • the reflective film 255 may include diffusion beads 255B therein. The micro lenses 255A and the diffusion beads 255B diffuse light passing through the reflective film 255 and not reflected by the reflective film 255, thereby emitting the light toward the optical member 230.
  • the supporting parts 252 protrude from the diffusing part 251 in the opposite direction to the direction of light emitted from the light guide plates 210.
  • the supporting parts 252 are inserted between the light sources 221 and 222 to support the diffusing part 251.
  • the diffusing part 251 of the optical diffusion member 250 may have a tetragonal plate shape with short and long sides in a dome shape that further protrude to the optical member 230 at an imaginary line connecting the centers of the short sides to each other, than at the long sides. That is, the optical diffusion member 250 may be convex and protruded toward the optical member 230. Accordingly, the light guide plates 210 are spaced a certain distance from the optical member 230, even if the supporting part 252 is not used.
  • the diffusing part 251 of the optical diffusion member 250 may have a tetragonal plate shape with short and long sides, and include a protrusion 256 that protrudes from the surface facing the optical member 230, to space the optical member 230 a certain distance from the light guide plates 210.
  • the protrusion 256 may longitudinally extend from one of the short sides of the diffusing part 251 to the other short side, to space the optical member 230 a certain distance from the light guide plates 210.
  • the protrusion 256 in FIG. 4C is a single, unitary, indivisible member, as compared to the plurality of discrete protrusions 256 in FIG. 4A .
  • FIGS. 7 to 9 Other exemplary embodiments of backlight units, and display devices including the backlight units, according to the invention will now be described with reference to FIGS. 7 to 9 .
  • Like reference numerals refer to like elements in FIGS. 1 to 6 , and a description thereof will be omitted. Thus, the following embodiments will be described with respect to different parts as those of FIGS. 1 to 6 .
  • FIG. 7 another exemplary embodiment of a backlight unit 200 of a display device according to the invention includes a light guide plate supporting member 257 coupled to an optical diffusion member 250 to support light guide plates 210.
  • the light guide plate supporting member 257 may have a plate shape and be disposed under a space between the light guide plates 210. That is, the light guide plate supporting member 257 is disposed opposite to the surface of the light guide plates 210 facing the optical member 230, and covers the space between the light guide plates 210.
  • a diffusing part 251 of the optical diffusion member 250 may include a through hole 253, and the light guide plate supporting member 257 may include a coupling hole 257A corresponding to and aligned with the through hole 253.
  • the light guide plate supporting member 257 is coupled to the optical diffusion member 250 through a coupling member 254 such as a screw or rivet inserted in the through hole 253, to thereby support the light guide plates 210. That is, the diffusing part 251 and the light guide plate supporting member 257 support the light guide plates 210 with a coupling force between the light guide plate supporting member 257 and the optical diffusion member 250. Thus, while the display device is used, a dislocation of the light guide plates 210 due to external shock can be prevented.
  • another exemplary embodiment of a backlight unit 200 of a display device may include a catching protrusion 252A disposed at the lower end of a supporting part 252, and an accommodating recess 257B disposed in the upper portion of a light guide plate supporting member 257.
  • the catching protrusion 252a and the supporting part 252 collectively form a single, unitary indivisible member.
  • the area of the catching protrusion 252A is greater than that of the supporting part 252.
  • the catching protrusion 252A may be inserted and accommodated in the accommodating recess 257B.
  • the optical diffusion member 250 can be coupled to the light guide plate supporting member 257 without using a separate coupling member. That is, the catching protrusion 252A of the optical diffusion member 250 is inserted and accommodated in the accommodating recess 257B of the light guide plate supporting member 257 to couple the optical diffusion member 250 to the light guide plate supporting member 257.
  • another exemplary embodiment of a backlight unit 200 of a display device may include a coupling hole 323 extended through a bottom surface 322 of a lower cover 320 at a position corresponding to a supporting part 252 of an optical diffusion member 250.
  • a coupling hole may also be extended through a bottom surface of the reflective sheet 240.
  • the optical diffusion member 250 may include a through hole 253 passing through a diffusing part 251 and the supporting part 252.
  • a coupling member 254 such as a screw or rivet is inserted in the through hole 253 to fix the optical diffusion member 250 to the lower cover 320.
  • the optical diffusion member 250 can more securely support the light guide plates 210 through the coupling member 254.
  • the backlight unit and the display device including the backlight unit include the optical diffusion member for diffusing light leaking between the light guide plates.
  • the leaking light which is not guided by the light guide plates, can be prevented from degrading the displaying quality of the display device.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP12161316A 2011-07-22 2012-03-26 Backlight unit and display devices including the same Withdrawn EP2549309A2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110073286A KR20130011855A (ko) 2011-07-22 2011-07-22 백라이트 유닛 및 이를 구비하는 표시 장치

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EP2549309A2 true EP2549309A2 (en) 2013-01-23

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EP12161316A Withdrawn EP2549309A2 (en) 2011-07-22 2012-03-26 Backlight unit and display devices including the same

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US (2) US8523420B2 (zh)
EP (1) EP2549309A2 (zh)
JP (1) JP6021452B2 (zh)
KR (1) KR20130011855A (zh)
CN (1) CN102889510B (zh)

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CN102889510A (zh) 2013-01-23
US20130308343A1 (en) 2013-11-21
CN102889510B (zh) 2016-06-22
KR20130011855A (ko) 2013-01-30
US20130021818A1 (en) 2013-01-24
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JP6021452B2 (ja) 2016-11-09
US8974070B2 (en) 2015-03-10

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